Find the incorrect statement from the following.

Options

A. Majority of Euglenoids are fresh water organisms found in stagnant water.
B. Slime moulds are saprophytic Protists.
C. All protozoans are heterotrophic and live as predators or saprophytes.
D. Dinoflagellates are mostly marine and photosynthetic.

Answer

To find the incorrect statement from the provided options regarding the kingdom Protista, we can analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding the Kingdom Protista**:
- Kingdom Protista includes a diverse group of organisms that can be autotrophic (like plants) or heterotrophic (like animals). Some protists can switch between these modes of nutrition.

2. **Analyzing the Statements**:
- **Statement 1**: "Many of the euglenoids are freshwater."
- This statement is true. Euglenoids are primarily found in freshwater environments, particularly in stagnant waters.

- **Statement 2**: "Slime molds are saprophytic protists."
- This statement is also true. Slime molds feed on dead and decaying organic matter, making them saprophytic.

- **Statement 3**: "All protozoans are heterotrophic and live as predators or saprophytes."
- This statement is incorrect. While many protozoans are heterotrophic, there are also photosynthetic protists like diatoms and dinoflagellates. These organisms are not heterotrophic and serve as primary producers in aquatic ecosystems.

- **Statement 4**: "Dinoflagellates are marine and photosynthetic."
- This statement is true. Dinoflagellates are primarily marine organisms and many of them are photosynthetic, contributing significantly to marine food webs.

3. **Conclusion**:
- The incorrect statement is **Statement 3**: "All protozoans are heterotrophic and live as predators or saprophytes."

### Final Answer:
The incorrect statement is **Statement 3**.

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